But to answer, I think it varies for me, mostly depending on color and sometimes eye focus. To give you an example:

In this photo, I assume the 2 in the back to be male, and then in the front row, going from left to right, male, female, male, male, female.

My reasons for the female ones are pretty vague...for the first one, I think it's due to the body and neck shape, and the second would be due to the coloring. Mouths also play a big part in my decision, for example the third frog in the front row would be female if it wasn't for mouth shape that tells me otherwise. It's weird how I associate gender with shape and color, but I do for some reason.

That's a good question but for some reason, I've always assumed those frogs on the picture are all male. Don't know why but I just do... It would be easier perhaps to tell male and female frogs apart if the females would wear bows on their heads or other accessories or if they, like charlietheowl said, had hair.

It just hit me... Bill and Gil both have hair! Maybe it's a city vs. swamp thing. Frogs who live in the swamp are bald and don't wear clothes, but city frogs have both. Kermit and Robin, who've left the swamp, are probably still swamp frogs at heart, which is why they only wear clothes on special occasions.

It just hit me... Bill and Gil both have hair! Maybe it's a city vs. swamp thing. Frogs who live in the swamp are bald and don't wear clothes, but city frogs have both. Kermit and Robin, who've left the swamp, are probably still swamp frogs at heart, which is why they only wear clothes on special occasions.